ASEA-SKF law holds vacuum concurrently to reach add shrinkage fitting buy. Can undertake agitate of low frequency electromagnetism and electric arc heat, vacuum takes off gas, to oxigenate, decarbonization, gather up broken bits causes basic slag to decoke, adjust composition. Fine time is long, requirement of fireproof data work is abominable.
ASEA-SKF steel wraps furnace to use fireproof data, aborning uses neuter broken bits or tall alkalinity slag, the steel of smelt to decoke is planted, position of broken bits line uses magnesian carbon brick, magnesian chromic brick, magnesia brick, magnesian dolomite brick; Sidewall and bag bottom use the tall aluminous brick of 75%Al203, bottom of molten steel line uses aluminous carbon brick; The tall aluminous brick that uses high quality to line of operation of beardless to decoke, broken bits (Al203>85%) , use by the bag pouring expecting is development direction.
LF-VD law is combination of the refined outside furnace (steel bag uses) as vacuum steel bag. LF is in often press next is opposite molten steel electric arc heats, the that blow argon mixes, alloy is changed reach fine of alkalescent white slag to wait. VD undertakes steel wraps vacuum smelt, its action is molten steel goes be mingled with of gas, to oxigenate, to decoke, purify, temperature of stimulative molten steel and composition are changed equably.
LF furnace is the molten steel that comes out steel-making of furnace of converter, electric arc, the course adds synthetic broken bits, alloying element, feed silk, blow argon and heat wait for a molten steel farther to oxigenate, to decoke and purify are metalloid equipment of the fine outside the furnace of be mingled with. What operate a condition as a result of these is abominable, make the service life of lining drops significantly. Accordingly, chosen lining is fireproof material is high-grade also change, service life is in commonly 50~100 furnace second, this basically is by the operation the condition is mixed defend a method different place causes.
And VD is taken again after some LF furnace, such service life drop further again, descendent scale and VD scale are concerned, the service life of broken bits line (S second) with VD scale (X% relation is: S=75-0.57x is in use process, different steelworks considers safety factor to differ, the operation requirement that still has different steel mill is different, very big to the influence of service life. If be 70%LF to VD, the one-time service life of brick of magnesian charcoal of broken bits line is 18~30 second.
To raise life of steel-making converter lining and electric stove certain and special place uses the life of fireproof material, develop quickly and developed contain carbolic qualitative firebrick. Up to now, magnesian carbon brick already made lining of aerobic steel-making converter the main body of fireproof material.
Position of ASEA-SKF slag line uses magnesian carbon brick, have higher fireproof performance to be shown alkalescent (MgO melting point 2805 ℃ ) , because this has capacity of better counteractive and alkalescent slag, but because linear expansion coefficient is taller ((14-15)X10-6 ℃ - 1, 0? 1500 ℃ ) , the thermal conductance when high temperature is inferior (λMg0, 100 ℃ =34.33
W/(m·K) , λMg0, 1000 ℃ =6.70 W/(m·K)) , heatproof flake ability is differred. Black lead is difficult by slag embellish wet, be able to bear or endure fusibility is good () of ℃ of >3000 of black lead melting point, and linear expansion coefficient is small (3.34×10-6 ℃ - 1, 25? 1600 ℃ ) , heat conduction performance is good (λ black lead, 1000 ℃ =229W/(m·K)) , because this is heatproof,flake the gender is good, but easy oxidation. Remarkable oxidation begins scale black lead 580 ℃ above is like temperature TA— . Black lead introduces in magnesian simple stuff, raised magnesian simple stuff to fight broken bits gender and fight flake ability.
Undertake to steel fluid inside steel bag electric arc heats, electromagnetism agitate and the technology of a kind of fine outside furnace that vacuum handles.
1, position of broken bits line: Magnesian carbon brick
2, sidewall uses magnesian carbon brick or aluminous carbon brick
3, brick of corundum pointed spar is used by the bag
The fine steel bag such as ASEA-SKF and LF, VAD uses fireproof material close, if typical fireproof material liner pursues
Commonly used and fireproof material has ASEA-SKF stove: Magnesian carbon brick, aluminous carbon brick, brick of corundum pointed spar, tall aluminous brick. Tall aluminium is pouring makings.
Get Price
WhatsApp